Support disk base for the bearing of an open-end spin rotor

ABSTRACT

Proposed is a support disk base ( 1 ) and a support disk for the bearing of a rotor of an open-end spinning apparatus, whereby on the outer circumference of the support disk base ( 1 ) a support ring ( 8 ) can be installed by force-fit. In accord with the invention, provided on the outer circumference of the support disk base ( 1 ) are grooves ( 3, 4, 5, 6, 7 ) running in the axial direction. Upon the operation of the support disk with the base ( 1 ), the said grooves ( 3, 4, 5, 6, 7 ) increase the holding power of a later circumferentially installed support ring against centrifugal forces. Further, a procedure for the manufacture of the basic form of a support disk is provided.

DESCRIPTION

[0001] The invention concerns a support disk base for a support disk for the bearing of a rotor of an open-end spinning apparatus, wherein, on the outer circumference of the said support base disk, a reinforcing ring can be attached by form-fitting.

[0002] In the case of a known support disk, (DE 41 36 794 A1) the base of the support disk is constructed in two parts, i.e., from an inner hub ring and a carrier ring affixed thereon. On the outer circumference of the carrier ring, is constructed, generally with the cross bar in the direction of the circumference, a T-shaped projection which a support ring will partially encompass, which support ring, is subsequently to be circumferentially affixed to the carrier ring. During operation of the support ring, it is subjected to strong centrifugal forces, whereby the ends of the support ring clamp about the T-ends of the said projection, which thus offer a resistance to the centrifugal forces. For a further improvement of the said resistance, placed on the edges of the circumference, in an axial direction, through the T-shaped projection, spaced borings are provided, through which the support ring likewise can grip. Thereby, there arises an encompassing connection of the support ring at the positions of the borings, so that the circular clamping of the support ring is even more improved. The production of such a two part support disk base is, however, very expensive in money and labor and said borings are required to be bored separately and individually in the case of a turned carrier ring. In the case of injection molding, exact through passages must be provided in the corresponding mold, whereupon the danger exists, that in the case of an inexactly prepared injection mold, or an imprecisely made closing mold, injection mold flash pieces remain in the borings after the removal of the carrying rings, which hinders the passage of the support ring material through the said borings. Moreover, there exists during the injection of the support ring on the carrier ring, the danger, that air may be encapsulated in the borings, which are enclosed on all sides by a wall, which, once again, interferes with a connection of the support ring material in the boring.

[0003] A further known support disk base (DE 198 04 868 A1) exhibits likewise axially running borings. For the avoidance of air inclusions in the axial borings, additional borings running in a radial direction outward are provided, which are located are perpendicular to the axially running borings. The radially directed borings or recesses serve for the escape of air upon the injection of the support ring at the outer circumference of the support base disk and additionally improve the holding power of the support ring, since, by means of two perpendicularly disposed borings placed one after the other, two webs occur, pointing in the circumferential direction, which are, on all sides, encapsulated by the material of the support ring. In the case of a such a double boring in the axial and radial directions, there arise, however, three bore sections, enclosed on all sides with walls, by which, again, the danger of an inclusion of air is present, if from both boring openings, approximately simultaneously, the injected material penetrates. Moreover, the manufacture of such a form is even more expensive. In the case of manufacture by injection molding, then, in each case, rework is required, so that the radial running borings are made. Imprecision in the rework can additionally lead to imbalance of the support disk.

[0004] Thus the purpose of the invention is to provide a support disk base with a support ring which can be mounted on said disk base and also to make available:

[0005] a procedure for the manufacture thereof,

[0006] wherein a support ring with a good retention, and without air occlusion can be installed on the support disk base and

[0007] the base body is simple to manufacture.

[0008] This purpose will be achieved with the features of the claims 1, 16 or 19.

[0009] In accord with claim 1, on the outer circumference of a support disk base, grooves are provided, running in an axial direction. The grooves increase the outer circumferential surface of the support disk base, so that, upon subsequent injection or the installation of the support ring, the surface contact between the support disk base and the support ring is improved. In this way, the retention of the support ring on the support disk base is correspondingly improved and the support ring cannot release itself from the support disk base by means of centrifugal force when said support disk base is operating.

[0010] The grooves form recesses on the circumference of the support disk base which are open in the direction of the circumference.

[0011] The air, which is contained in the groove, because of said direction of opening, can easily escape upon the injection of the support ring material and consequently, no air remains occluded in the groove.

[0012] In a particularly advantageous embodiment of the invention, the grooves are at least partially open on one or both end faces in the axial direction. In this way, upon the injection of the support ring material, the air can escape in two or three directions, so that entrapment of air in the grooves cannot result. Along with this advantage, the reproducibility of the quality of the support disk is overall increased, the necessity of an intensive material examination is avoided, and the risk of downtime is minimized.

[0013] Moreover, the base body of the support disk can be manufactured in an especially economical and simple manner. For example, in the case of an injection molding mold, any possible remainder of molding flash can be easily removed from the groove by abrading from the outer circumference. It is no longer necessary to ream out a totally enclosed boring with a special tool. Further, the basic body can be easily manufactured by extrusion methods, wherein the grooves are easily made by the use of complementary projections on the press tools. Thereby, the development and the manufacturing costs for such compression or extruding tooling are reduced. Since the so manufactured extrusion is custom cut to the specified thickness of the support disk base, no further rework steps for the axial running grooves is necessary. If lateral grooves are required, or grooving on the circumference is to be provided, then these can subsequently be reworked on the raw casting in a simple manner, for instance, by an automated lathe.

[0014] In the case of employment of extrusion products, the material consumption is substantially reduced, since, for the formation of the grooves, no subsequent material discard is necessary.

[0015] If the support disk base itself is constructed in two parts, comprising a hub, or a hub disk, and a carrier ring removably placed thereon, then later, when wear has become evident, the carrier ring with support ring can be exchanged by slidingly withdrawing the carrier ring from the hub, which is much like a wheel rim. This feature reduces the operational costs for the support disk.

[0016] In a particularly advantageous embodiment, the groove is back-cut. In this case, the opening width of the groove radially pointing to the outside of the support disk base is smaller than the width of the groove at the widest point of said groove within the circumference. Besides surface retention of the support ring onto the support disk base by means of form-fit, mechanical clamping is achieved, with opposes a release of the support ring in the radial direction.

[0017] Dependent upon the material characteristics of the support disk as well as being dependent on an optimized manufacture, the cross-sections of the grooves can be designed in various modes. If the groove shapes are additionally asymmetrical, in relation to a reflection plane, which would be placed along a radius through the center of the groove and the axis of rotation of the support disk base then, from this fact, an optimization of the holding power in relation to the direction of rotation of the support disk is possible.

[0018] For the further increasing of ring-retention by means of enlarging the contact surface between the support disk base and the support ring, and/or by means of form-fit through mechanical circumferential clamping of the support disk base by means of the support ring, at least one lateral groove is constructed. To this end, also a running groove on the outer circumference or a corresponding recess is provided.

[0019] A particularly advantageous retention of the support ring on the support disk base can be achieved by a swallow tail type projection on the outside circumference, by means of which both the contact surface between the support disk base and the support ring is particularly large, and as well, the support ring circumferentially grasps the said projection.

[0020] In accord with claim 16, in the outer circumference of the support disk base, that is to say, in a radial direction or in approximately in a radial direction, protruding knob like projections are designed. For example, the construction of the knob-like projections is a critical case of the above described support disk base, whereby, grooves, extending in the axial direction, lie so closely next to one another, that between the grooves, remnant material builds up protrusions which run in an the axial direction.

[0021] With this, the contact surfaces between the support disk base and the support ring are substantially increased in area, so that the holding power of the support ring onto the support disk base is correspondingly bettered. The knob-like projections present a protective structure, which extends itself, after the installing of the support ring, into the material of the said support ring and binds and stabilizes the said ring with the support disk base.

[0022] If the cross-section of the knob-like projections on the base be tapered, that is in the area of the unstructured, i.e. unprofiled outer circumference of the support disk base, in relation to the cross-section in the outer area, then, besides the surface holding power, also a mechanical anchoring of the support ring on the support disk base is achieved. This is valid in the case of an embodiment, in which the knob-like projections are constructed in a hook like manner.

[0023] With the aid of the drawings, embodiment examples of the invention are described and explained more fully.

[0024] There is shown in:

[0025]FIG. 1A a profile view of a fundamental support disk base with various embodiments showing shapes of axial recesses opening on the outside circumference,

[0026]FIG. 1B a cross-section A-A of FIG. 1A of the basic support disk with a support ring,

[0027]FIG. 1C a cross-section B-B of FIG. 1A of the basic support disk

[0028]FIG. 1D a first perspective view of the basic support disk of FIG. 1A

[0029]FIG. 1E a second perspective view of the basic support disk of FIG. 1A, and

[0030]FIG. 2 a second embodiment example of the basic form of a support disk with various projecting protrusions on the circumference.

[0031]FIG. 1A shows the side view of a basic form 1 of a support disk. The inner zone is constructed in the manner of a hub, whereby this basic form 1, having a central boring 2 can slide onto a shaft or be force fit thereon. On the outer circumference of the basic form 1, are recesses 3, 4, 5, 6 and 7, arranged to run in an axial direction. The exemplary embodiment shown here of these recesses 3, 4, 5, 6 and 7 present, in fact, different variants of axial recesses, each set of which has a different cross section and, in relation to the circumference, the recesses exhibit different separating distances. As is demonstrated in the cross-section of FIG. 1B, a support ring 8 is installed on the outer circumference of the basic form 1. Subsequently, in a known manner, the shaft of a spin-rotor of an open-end spinning machine rolls on this support ring 8.

[0032] Referring to FIG. 1A, a section of the outer circumference of the basic form 1 is designated with “a” and demonstrates axial recesses 3, each hexagonal in cross-section. One side of each hexagon opens outward from the circumference of the basic form 1. The recesses 3 are apportioned about the said circumference at equal angular separations from one another, whereby the basic form 1 has a total of twelve such recesses 3.

[0033] Referring to FIG. 1A, a section of the outer circumference of the basic form 1 designated “b” shows, again at equal angular spacing, axial recesses 4 which have an approximately circular cross section, wherein a segment of the circular cross section opens from the circumference. In the case of this embodiment, there are, on the circumference, a total of 24 recesses separated from one another as described.

[0034] The section in FIG. 1 of the outer circumference of the basic form 1 designated as “c”, shows axial recesses 5, again of an approximately circular cross section. The recesses 5, in this case, are clustered group-wise beside one another, whereby, between said groups a larger angular spacing occurs, as compared to the spacing of the recesses within the said group.

[0035] In the outer (circumferential) section “d”, of FIG. 1, each axial recess 6 has a more or less trapezoidal cross-section, whereby this recess, in comparison to the other recesses 3, 4, 5 and 7 if designed somewhat flatter. By virtue of this, the depth of this axial recess is radially less than the height of one of the swallow tailed projections 9, circumferentially disposed about the basic form 1 as seen (dotted line) in FIG. 1B.

[0036] In the circumferential section designated as “e” in the FIG. 1A, are shown embodiments of axial recesses 7, in which the cross-section is somewhat triangular. In the case of these recesses 7, the relationship between the maximal circumferential depth of the recess 7 and the circumferential breadth of the said recess is at a maximum.

[0037] In this case, the support ring 8, which is to subsequently installed, has an especially higher holding power against release in the radial direction. The support ring, which is as wear resistant as possible, serves as an elastic overlay on the basic form 1, serving as the rotatable bearing of the rotor shaft of an open-end spin-rotor.

[0038] The arrangement of the regularly, or unregularly separated, axially running recesses or grooves on the outer circumference of the basic form 1 is so carried out, that the center of gravity lies in the center of the basic form 1, so that when in operation, no unbalance occurs due to the support disk.

[0039] For the increasing of the holding power, that is to say, the increasing of the contact surface of the basic form 1 with the support ring 8, on the outer circumference of the basic form 1 a V-shaped groove 10 is designed. This groove 10 runs completely about the circumference and is only interrupted by the axial recesses 3, 4, 5, 6, 7.

[0040] On both sides of the basic form 1, run grooves 11, which, together with the central groove 10 give rise to the forked shape of a projection 9.

[0041] The support ring 8, which is carried on the outside circumference locks itself in a clamping way about the forked projection 9, so that the holding power of the support ring 8, when subjected to centrifugal forces is additionally increased.

[0042] The basic form 1 can be produced by means of a casting mold or by an injection mold which is simple in its design. Alternatively, the basic form 1 can be made by extrusion, wherein the extrusion mold is likewise simple in design. Further, the basic form 1 can be made by direct compression molding and/or stamping. The basic form 1 is advantageously made of metal, preferably aluminum. Even so, the basic form 1 can be made of a plastic which is stable in shape, which is resistant to creep and loading.

[0043] In accord with the design of the basic form 1, the support ring 8 is fitted onto the said basic form 1. This is done by a sliding fit, injection molding, direct casting, or the like. The material of the support ring is either natural or synthetic rubber, or it may be polyurethane, a polymer raw material, or another substance. In any case, the material is to exhibit a small degree of wear when subsequently employed against the spin-rotor shaft in frictional or rolling contact, when said shaft is in a bearing relationship therewith.

[0044] The circumferentially disposed grooves 10, 11, are made after, or during the production of the basic form 1. For example, the grooves 10, 11 can be made by a peel-off pressure tool during lathe-working of the basic form 1. Alternatively, the grooves 10, 11 can be milled, turned, or stamped-out with a stamping die.

[0045]FIG. 1B shows a cross-section of the basic form 1, along the section line A-A of FIG. 1A, wherein the support ring 8 is schematically presented on the outer circumference, also in cross section. Following the injection of the support ring material, this material fills the axial recesses (3, 4, 5, 6, 7) completely. FIG. 1C shows a cross section through the basic form 1 along the line B-B of FIG. 1, absent the support ring. The FIGS. 1D and 1E show different perspective views of the basic form of FIG. 1.

[0046] Because of the fact, that the axially running grooves 3, 4, 5, 6, 7 at the outside circumference of the basic form 1 open radially to the outside, it is possible that later, for the recycling of a support disk, the support ring can be cut through in a radial direction and then peeled off along the outside circumference, without having remnants of the material of said support ring 8 remaining in the said axial grooves. In this way, a 100% material separation is carried out, which provides a very high recycling quality.

[0047]FIG. 2 shows a schematic profile view of a second embodiment example of a basic form 1′, on the outer circumference of which, different variants of knoblike or mushroom like projections 12, 13, 14 are presented. On one basic form 1′ possible projections as shown, although differently shaped projections 12, 13, 14 can also be employed, which are in arranged at equal or unequal distances of separation.

[0048] The presented projections 12 in the circumferential section “f” are placed longitudinally along the axial depth of the basic form 1′ and exhibit in the circumferential direction an approximation of a triangular cross-section.

[0049] The presented projection 13 in the circumferential section “g” possess, both in the axial direction as well as in the circumferential direction a generally V-shaped cross section. The axially running projections of V-shaped cross-section, are achieved by lateral indentation, which correspond to the grooves 11 shown in FIG. 1C.

[0050] The knoblike projections 14 which are shown in the circumferential section “h” are rotationally symmetric, wherein, upon on a columnar post, a disklike platform is laid.

[0051] The projections 14 are off-set from one another in the axial direction on the circumference, so that these said projections are caused to stand as close to one another as possible on the outer circumferential surface. 

Claimed is:
 1. A support disk base for a support disk for the bearing of a rotor of an open-end spinning apparatus, whereby on the outer circumference of the support disk base (1, 1′) a support ring (8) can be form-fit attached, therein characterized, in that on the outer circumference of the support disk base (1, 1), are placed grooves (3, 4, 5, 6, 7) running in the axial direction.
 2. A support disk base in accord with claim 1, therein characterized, in that the support disk base (1, 1′) is constructed in at least two parts from a hub and a removable carrier ring for the support ring (8).
 3. A support disk base in accord with claim 1 or 2, therein characterized, in that the grooves (3, 4, 5, 6, 7) are at least partially open on one or two sides in the axial direction on the side surface of the support disk base.
 4. A support disk base in accord with claim 1, 2 or 3, therein characterized, in that the groove (3, 4, 5, 6, 7) is back-cut.
 5. A support disk base in accord with claim 4, therein characterized, in that the cross section of the groove (6, 7) is essentially triangular or trapezoidal with an apex or side open to the outer circumference of the support disk base (1, 1′).
 6. A support disk base in accord with claim 4, therein characterized, in that the cross-section of the groove (4, 5) is essentially round.
 7. A support disk base in accord with claim 4, therein characterized, in that the cross-section of the groove (3) is a polygon with one side open to the outside circumference of the support disk base (1, 1′).
 8. A support disk base in accord with one of the foregoing claims, therein characterized, in that the groove is asymmetric relative to a section plane through said groove, which plane is defined by the axis of the support disk base (1, 1′) and a radius through said groove.
 9. A support disk base in accord with one of the foregoing claims, therein characterized, in that the support disk base (1, 1′) has at least one groove (11) running circumferentially on the side of the said support disk base.
 10. A support disk base in accord with claim 9, therein characterized, in that at least one of the lateral grooves (11) is continuously circumferential.
 11. A support disk base in accord with one of the foregoing claims, therein characterized, in that at least one groove or recess (10) is constructed to run about the outer circumference of the support disk base (1, 1′).
 12. A support disk base in accord with claim 11, therein characterized, in that at least one of the grooves or recesses running on the outer circumference is interrupted by the axial grooves (3, 4, 5, 6, 7).
 13. A support disk base in accord with claim 11 or 12, therein characterized, in that the groove running on the outer circumference is back-cut.
 14. A support disk base in accord with one of the foregoing claims, therein characterized, in that on the outer circumference of the support disk base (1, 1′), a projection (9) is constructed with a V-shaped cross section, which is at least partly interrupted by the axial grooves (3, 4, 5, 6, 7).
 15. A support disk base for a support disk for the bearing of a rotor of an open end spinning apparatus, wherein a support ring (8) is mounted in a form-fit manner on an outer circumference of the support disk base (1, 1′), therein characterized, in that on the outer circumference of the support disk base (1, 1′) are constructed protruding, knoblike projections (12, 13, 14).
 16. A support disk base in accord with claim 15, therein characterized, in that at least a part of the knoblike projections (12, 13, 14) in the area of their bases, exhibit a smaller cross-section than in the upper area.
 17. A support disk base in accord with claim 15 or 16, therein characterized, in that at least a portion of the knoblike projections are hooklike in design.
 18. A support disk with a support disk base in accord with one of the foregoing claims and a support ring (8) installed upon the support disk base (1, 1′).
 19. A procedure for the manufacture of a support disk base (1, 1′) or a carrier ring of a support disk of an open-end spinning apparatus, the procedure having the steps of: the extruding of a support base with at least axial running grooves on the outer circumference of the said support base, and the cutting to length of the extruded material to the thickness of, or approximately to the thickness of, the support disk base (1, 1′) or of the carrier ring.
 20. A procedure in accord with claim 19, characterized by the step: abrading, machining, compression molding, and/or milling of the lateral circumference and/or on the groves (11, 10) on the outer circumference.
 21. A procedure in accord with claim 19 or 20, therein characterized, in that the shape of the axially running grooves, the lateral grooves running on the circumference, and/or the grooves running on the outside circumference is established in accord with one of the claims 1 to
 16. 22. A procedure in accord with claim 19, 20, or 21, therein characterized, in that the surface of the support disk base (1, 1′), at least in the area of the outer circumference, is roughened, especially by means of sand blasting. 